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  <title>Copies data from one stream to another</title>
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  <div id="layout-content"><div id="function.stream-copy-to-stream" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">stream_copy_to_stream</h1>
  <p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">stream_copy_to_stream</span> &mdash; <span class="dc-title">Copies data from one stream to another</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.stream-copy-to-stream-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>stream_copy_to_stream</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$source</code></span>
   , <span class="methodparam"><span class="type">resource</span> <code class="parameter">$dest</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$maxlength</code><span class="initializer"> = -1</span></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 0</span></span>
  ]] ) : <span class="type">int</span></div>

  <p class="para rdfs-comment">
   Makes a copy of up to <code class="parameter">maxlength</code> bytes
   of data from the current position (or from the
   <code class="parameter">offset</code> position, if specified) in
   <code class="parameter">source</code> to <code class="parameter">dest</code>. If
   <code class="parameter">maxlength</code> is not specified, all remaining content in
   <code class="parameter">source</code> will be copied.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.stream-copy-to-stream-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">source</code></dt>

     <dd>

      <p class="para">
       The source stream
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">dest</code></dt>

     <dd>

      <p class="para">
       The destination stream
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">maxlength</code></dt>

     <dd>

      <p class="para">
       Maximum bytes to copy
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">offset</code></dt>

     <dd>

      <p class="para">
       The offset where to start to copy data
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.stream-copy-to-stream-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the total count of bytes copied,  或者在失败时返回 <strong><code>FALSE</code></strong>.
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.stream-copy-to-stream-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.1.0</td>
       <td>
        Added the <code class="parameter">offset</code> parameter
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.stream-copy-to-stream-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4818">
    <p><strong>Example #1 A <span class="function"><strong>stream_copy_to_stream()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$src&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'http://www.example.com'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'r'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$dest1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'first1k.txt'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'w'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$dest2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'remainder.txt'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'w'</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">stream_copy_to_stream</span><span style="color: #007700">(</span><span style="color: #0000BB">$src</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$dest1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1024</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"&nbsp;bytes&nbsp;copied&nbsp;to&nbsp;first1k.txt\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">stream_copy_to_stream</span><span style="color: #007700">(</span><span style="color: #0000BB">$src</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$dest2</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"&nbsp;bytes&nbsp;copied&nbsp;to&nbsp;remainder.txt\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.stream-copy-to-stream-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="copy.html" class="function" rel="rdfs-seeAlso">copy()</a> - 拷贝文件</span></li>
   </ul>
  </p>
 </div>

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